diff --git a/app/models/competition_team.rb b/app/models/competition_team.rb
index 7b0e6d50..a8f48b3e 100644
--- a/app/models/competition_team.rb
+++ b/app/models/competition_team.rb
@@ -12,7 +12,7 @@ class CompetitionTeam < ActiveRecord::Base
 
   def teacher
     teacher_id = self.teachers.first&.user_id
-    User.find_by(id: teacher_id)
+    User.where(id: teacher_id).first
   end
 
   def group_members